Coating composition for metal sheet for two-piece can and metal sheet coated with the composition

A coating composition to be coated on a metal sheet for forming a two-piece can;

• the composition being a solution consisting essentially of:
• (A) from 70 to 99 parts of a polyester resin (A), which is composed of:
• (1) an acid component comprising from 60 to 100 mol % of terephthalic acid and from 0 to 40 mol % of other dicarboxylic acid(s) than terephthalic acid,
• (2) a glycol component comprising from 40 to 100 mol% of propylene glycol and from 0 to 60 mol % of other aliphatic or alicyclic glycol(s) than propylene glycol, and
• (3) from 0.1 to 3 mol%, to the total acid component or total glycol component, or tri- or more functional polycarboxylic acid(s) or polyol(s) and which has a reduced viscosity of 0.3 or more, said polyester resin (A) having:
• (1) a glass transition temperature of 40.degree. C. or higher,
• (2) a specific gravity of 1.25 or more, and
• (3) a dissolution parameter of 10.5 or more;
• and
• (B) from 1 to 30 parts of an alkyl-etherified aminoformaldehyde resin (B);
• dissolved in an organic solvent;
• (C) the organic coating film (C) to be obtained by reacting the polyester resin (A) and alkyl-etherified aminoformaldehyde resin (B) in the composition having the following characteristics:
• (1) the tensile strength at break (kg/mm.sup.2) and the tensile elongation at break (%) of the organic coating film (C) are larger than those of a film made of only (A), and
• (2) the organic strength at break of coating film (C) has a tensile strength at break of 5 kg/mm.sup.2 or more and a tensile elongation at break of 5% or more.